role = $role; $this->scheme = $scheme; $this->name = $name; } public function __toString() { // There is no $this->data here return md5(serialize($this)); } public function get_role() { if ($this->role !== null) { return $this->role; } else { return null; } } public function get_scheme() { if ($this->scheme !== null) { return $this->scheme; } else { return null; } } public function get_name() { if ($this->name !== null) { return $this->name; } else { return null; } } }